First, when the pipe adopts a galvanized electrical pipe, except for the clear specifications of the design, the pipe and the tube, the tube and the metal box do not need to be connected, but the following provisions should be complied with:

1) When using a threaded connection between the pipes, the length of the pipe ends should not be less than 1/2 of the length of the pipe joint. The surface of the thread should be smooth, rusty, and defect. The thread should be applied to the power complicated fat or conductive anticorrosive fat. After the connection, the thread should be exposed 2 ~ 3 buckles.

2) When the tube is connected with a sleeve with a tight screw, the screw should be tightened; in the venue of the vibration, the screw should have anti -loosening measures.

3) The connection between the tube and the box should not be used in plastic Naizi, and the metal nazi of the conductive should be used.

4) When there is a PE wire in the weak electric pipe, each wiring box should be connected to the PE line.

2. When the pipe adopts a galvanized electric pipe, when the design also stipulates that the pipe needs to be connected, the following provisions should be complied with:

1) The tube of the bright application should not be spanned by melting welding, and the dedicated to the next thread card crossing should be adopted.

2) Buried or buried electric pipes in the concrete. Without the application of a wire card to cross, the melting welding can be used.

3) If there is a naked soft PE copper wire in the tube, the electric pipe will not be connected. This PE cable must be connected to each wiring box it passed.

Third, when the pipe uses a black iron pipe, if the design does not require a cross, there is no need to cross. If you are required to be connected, a round steel can be used between the black iron pipe and the wiring box between the black iron pipe and the wiring box, and the single -sided welding can be used. When crossing between the zinc bridge, a copper bolt should be welded at the end of the black iron tube, and the copper guide line of not less than 4mm is connected to the galvanized bridge.

Fourth, when the strong and weak electricity uses the PVC tube, in order to avoid interference, the weak electric pipe should try to avoid laying parallel with the strong power pipe. If it is necessary to lay it in parallel, the distance between the distance should be greater than 0.5m.

Fifth, when the strong and weak electrical wire slot is laid, the strong and weak wire groove should be separated; when it needs to be laid on the same line, the application of metal partitions between the strong and weak electricity is separated.